In message , The Natural Philosopher
writes
On 20/05/2019 21:27, R D S wrote:
On 20/05/2019 19:49, The Natural Philosopher wrote:

First though is te floora groud floor. 1" of insulation is not
enough for a ground floor. 6" minimumum

It is a ground floor, is that right? That would be disappointing,
though I can see the danger of heating the space under the house.

Ah. You didn't mention it was a suspended floor.

Lift it, and put 6" celotex between the joists, tape over, and then lay
your pipes on top

No need for poly ,poulding. Just use big plastic staples to located
them to the celotex If the joists are stable you can screed/tile or
else overboard with ply and engineered wood.

Aim for a spacing of around 4" between pipes to get best output.

Umm.. you have to slot the joists for the pipe return. An alternative is
to use the pre-formed 22mm slotted flooring chip plus your choice of
overboard. If you fancy ceramic floor tiles there are cement based
boards for this.

Have a look in here or one of their many competitors
https://www.thefloorheatingwarehouse.co.uk/


--
Tim Lamb